I’d like to share my experience (challenges and successes) as a fairly untalented runner trying sweet-spot/NSA training with no exceptional baseline speed or long distance talent (in HS never broke 65 in the 400m, 2:15 in the 800m, 5:00 in the 1600m, or 10:50 in the 3200m). When training 30mpw on a speed program, I’ll be able to sneak under 60 for 400m, but then can barely run a 17:00 for 5000m. When building from that program to a longer distance one (5000-10,000m), I’m usually hitting 70-80mpw and running low-16:00 for 5k and 35:00 for 10k but can barely hit 62 for 400m. In other words, I lose endurance fitness rapidly when focusing on speed and anaerobic power, but lose speed and speed endurance rapidly when training for long distances (even when doing strides and sprints after longer workouts). When switching between these programs in either direction, I can keep some of the benefits for at least a couple months but lose them slowly after that. When doing a hybrid of these programs, I am middling at both short and long distances (vs. focusing on either). It sucks to not have any strengths, but I think I am figuring how to manage it.
Now, I followed “textbook” NSA to the tee for about 18 months (about 50-60mpw with 3x10min, 5x6min, 10x3min sub-T based on periodically updated Friel’s tests) and had similar results as I did with slightly higher mileage programs. Cool to see some aerobic benefits at a tad lower mileage, but I still could not handle faster paces. I tried to do NSA with and without strides over the course of that 18 months, and no matter what, same result when trying to run faster. It was like I was getting stronger (more enduring) but never able to access any speed. Then I thought, maybe I’ll introduce the 25x1min workout instead of the 5x6min workout. As it turns out, this is a magical workout for my physiology. It is speed-endurancey due to the supra-threshold mechanical stress but ultimately still sub-T from a physiological standpoint. All of my paces improved for other sub-T efforts over the next few months, and suddenly I hit PRs in the mile (4:23), 5k (15:05), and 10k (32:12). Kind of crazy. I am thinking now that for my kind of musculature and physiology that favors neither speed nor endurance, the middle ground 25x1min or 25x400m workout is highly valuable because it doesn’t detract from aerobic progress the way that sprints and hill sprints do, but offers plentiful mechanical benefits that some (but not all) people need. I now do one, sometimes two, 25x1min workouts per week (always keeping 3x10min in the mix to counterbalance), and both my aerobic and muscular strength have improved at once it seems. Anyway, long post but when trying to find the right stimulus/load with this kind of method, I have realized through trial and error that for some folks there is utility in considering extra mechanical load to strengthen the muscles alongside the aerobic gains. I’m working on adding a bit extra mileage before extending the sub-T workouts themselves, but for whatever reason have been feeling stronger than ever doing both the shortest sub-T reps with the longest sub-T reps each week (plus a third sub-T that is either 5x6min or another 25x1min).
Learned a lot from the folks in this thread, and although I nearly thought I was a non-responder, I found an NSA variant that works for me super well while keeping the other central tenets.